ML20091Q885

Colt Diesel Generator Summary for Shoreham Nuclear Power Station - Unit 1

ML20091Q885
Person / Time
Site:	Shoreham File:Long Island Lighting Company icon.png
Issue date:	06/30/1984
From:	STONE & WEBSTER ENGINEERING CORP.
To:
Shared Package
ML20091Q874	List: ML20091Q885 SNRC-1049, Forwards Colt Diesel Generator Summary for Shoreham Nuclear Power Station - Unit 1. Installation of Colt Diesel Generators Scheduled for Completion in May 1985
References
NUDOCS 8406140186
Download: ML20091Q885 (25)

Text

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I-a COLT DIESEL GENERATOR-

SUMMARY

FOR-

.SHOREHAM NUCLEAR POWER: STATION - UNIT 1 LONG ISLAND LIGHTING COMPANY J

JUNE, 1984 1

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. STONE.&, WEBSTER ENGINEERING CORP, ORATION A

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• TABLE OF CONTENTS Section Title Page

~1 GENERAL DESCRIPTION 1-1 2 DIESEL GENERATOR BUILDING 2-1

2.1 DESCRIPTION

OF STRUCTURE 2-1 2.2 -APPLICABLE CODES, STANDARDS, AND SPECIFICATIONS 2-2 2.3 LOADS AND LOADING COMBINATIONS 2-2 2.4. DESIGN AND ANALYSIS PROCEDURES 2-2 2.5 'STRUCTURALJACCEPTANCE CRITERIA 2 2.6 MATERIALS,. QUALITY CONTROL, SPECIAL CONSTRUCTION 2-2 TECHNIQUES, AND QUALITY ASSURANCE

'3 ELECTRICAL DESCRIPTION 3-1 3.11 RATING 3-1 3.2 SIZING CRITERIA ~ 3-1

>3.3' iLOADING' CONDITIONS 3-1 3.4 ' STARTING. 3-2

.3. 5 TRIPPING" SYSTEM: 3-2 3.6 SURVEILLANCE 3-3 4 DIESEL GENERATOR AUXILIARY SYSTEMS 4-1~

. 4 .1 -

JAPPLICABLE CODES,= STANDARDS, AND SPECIFICATIONS 4-1

-4.2 DIESEL GENERATOR FUEL OIL STORAGE AND TRANSFER SYSTEM 4-l' P 4.3 DIESEL GENERATOR COOLING WATER. SYSTEM 4-2 4.4' DIESEL GENERATOR AIR START SYSTEM 4-3 4.5 DIESEL' GENERATOR LUBRICATION SYSTEM 4 4.6- COMBUSTION AIR INTAKE AND EXHAUST SYSTEM- ~4-5.

4.7 DIESEL GENERATOR BUILDING VENTILATION 4-6 4.8 ~ FIRE' PROTECTION SYSTEM 4-8 i

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SECTION 1

'GENERAT DESCRIPTION

. Standb'y- ac power ' for 'the plant :is- supplied .f rom three diesel generators.. .Each of the three generators is arranged for con-nection to - one .of three independent and physically separated

.. ' 4.16-kV switchge ars which. supply ac power required for a safe

- shutdown.'

Power . ' supplie s - for ' essential' ~ auxiliaries are arranged .so that f ailure -of any single _switchgear bus or diesel generator supply

unit ,will not jeopardize proper operation of redundant systems supplied from other : switchgear ' buses. Under this condition, adequate .ac power 'is available for safe shutdown - of the plant under all_ postulated accident conditions.

- The- location of 'the Diesel -Generator Building is shown on Figureal-1.

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SECTION 2-DIESEL GENERATOR _ BUILDING

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l2.1.(DESCRIPTION OPESTRUCTURE h .4

.p y  ; TheiDiesel; Generator Building. -(Figures l 2-1 and 2-2) is a QA C-

? Category 'I','creinforced- : concrete structure. -It houses' three

, Colt -Pielsticki 4430. kW- (4150 kW)* diesel generators 'in three

! separated rooms. Thes'e. diesel generators will.be used to supply.

' emergency ~ Lpower. :.during a . loss _ of ~ of f site power . or a loss of

. coolant -accident , coincidenti with a -loss _ of _ of f site . power. The

building 71s . erected . in a low radiation

one area' so as to'be 4

caccessibl'e to' authorized personnel at-all times.

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jThefbuilding's external. dimensions.are 110 feet in the N-S direc-

- > ,(tion ~ and ;85 : feet in the ~ E-W ' direction.

Each room has inside

. dimen s ion s :. o f 1 app roximate ly 3 4 . f e e t .. b y . - 8 0 . 5 feet. The one-story

/ 1 b u i l d i n g .' h a's i t h e - air- ' intake Land : exhaust - hoods on the roof at lopposite . en.ds fof'. the b'uilding. . Leach diesel' generator is located

'at' the e center of its) room 'with ~ the . longest dimension running in s . the ; E-W '. direction . - . Openings with removable plugs - are- provided : in:

the east-wall'for-'theqinstallation and removal-of the generators.

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'At.the~ west endiof the room is the. electrical room under which-is

[ c 7the J : cable f vault 7 area where ' the : electrical duct banks enter - the -

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. building._ The-interior walls'between-each' room provide.1a hour a"  ! fire rating isolating each: room. TheVbuilding is ' watertight to

_ ' withstand'the; probable maximum hurricane flood level.

iTh'elgrade!.levelDoutside.the~ building is atEel-20 feet. The bottom

'offthe foundation.'-is at el-11 feet.

s The foundation-consists,of-a 6:foo't 3finchLthick reinforced-concrete:1 mat 1with the exception.of.

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.the[cablelvault' area'where13-foot, thick; footings'are usedis TheLdiesel generator; foundations 'are integral -with the 6 foot-3

' linchi thick smat. The' top elevation of:the. diesel-generator foun-

/ d a t i o n s -- a r e e at el . 21. f eet. Surrounding. each ' diesel generator

. foundation--is; a , pipe trench-approximately 4 feet . wide and 3. feet-

.deepc-lThe top offtheofloor. slab is at-el 20 feet-6 inches.

The

, main, roof ofithe? building is atiel-53. feet-6 inches, and the roofs

, for the; air-intake hood and the. exhaust hood are at el 69-feet-6.

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<*The c ratings shown in . parentheses' will be indicated on -the-nameplate 7to c indicate the . reduced - field testing limits.. These reduced' ratings . exceed the expected maximum coincidental- load N .

and ; are: ' consistent with ~ industry experience which suggests that c runningLdiesels.below1 nameplate ~ ratings is desirable.

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'2.2~- APPLICABLE CODES, STANDARDS, AND SPECIFICATIONS l iThe codes, : specifications, standards,- and NRC Regulatory Guides used . in establishing design methods, analytical- techniques , .and

material

properties - for the Diesel Generator-Building 'a r e listed in FSAR Section 3.8.4-2. .

f2.3!: LOADS AND LOADING COMBINATIONS The loads and. loading combinations used for the design of Diesel Generator Building.. are specified in FSAR .Section 3.8.4.3. In t a d d i t i o n ,.. the load -combinations ~ and minimum acceptable safety factors used for stability calculations .are specified in FSAR-Section~3.8.5.5.

. 2 .'4 DESIGN'AND ANALYSIS-PROCEDURES The ; Diesel Generator Building 'is analyzed and designed for the

' loading: combinations as outlined in FSAR Section 3.8.4.3.- The determination of-the seismic. forces'is presented in.FSAR-Section

-3.7.- The z equivalent- wind pressure ,for the design of the structure is. presented in FSAR Section 3.3.

2.51 ' STRUCTURAL ACCEPTANCE CRITERIA The structural acceptance criteria are given -in FSAR Section

3.8.4.5.

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.: 2. 6 .MATERI ALS , . QUALITY CONTROL ,

SPECIAL CONSTRUCTOR TECHNIQUES, AND QUALITY ASSURANCE

,e . . Materials, quality - control, special' construction technique s ,- and t' quality. assurance requirements for the Diesel Generator' Building are . described in. FSAR Section' 3.8.4.6 with- ;the following exceptions:

l '. Reinforcing bars No. 3 through and including No. 6 conform to

.the requirement of. ASTM A615, Grade 4 0. - Reinforcing bars No.

7.through and including No. 11 conform;to the requirements of ASTM A615, Grade 60.

2 .H Water ' stops are provided -in all horizontal and vertical construction; joints up to el 30 feet-0 inch with the exception of the' north wall where they are provided up to el 43 -feet-5 inches, consistent with 'the FSAR which addresses: protection'from a probable maximum. hurricane.

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-SECTION 3

-= ELECTRICAL-DESCRIPTION 4 3.1 RATING The ' onsite ' standby power -f aciliti.es consist of three identical diesel generator units. Each unit is rated as follows:

. voltage, V- ', 416 C-Rpm; 514

. Frequency, Hz 6 C'-

Power factor 0.8 Continuous 8760 hour0.101 days <br />2.433 hours <br />0.0145 weeks <br />0.00333 months <br /> kW rating 4430 (4150)*

Short-time kW rating (2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> in 24) 4873 (4430)*

3.2 ' SIZING-CRITERIA-

"The criteria used to size the diesel generators are:

1. Any ^ two diesel generators are . capable of mee' ting the maximum demand caused by a-loss of cooling. accident and any other design basis event.

2. .The continuous 8760-hour reduced rating (4150 kW) of each -diesel generator exceeds the maximum coincidental load.

3. Each diesel generator is capable of starting,' acceler-

. 'ating, and accepting'in the required sequence all of its engineered safety features.and emergency shutdown loads.

Sizing of the diesel generators. 'is consistent with Regulatory Guide 1.9.

'3.3 LOADING CONDITIONS The estimated maximum coincident demand is 3949 kW.** This demand will - occur on CG 903 within .10 minutes after a loss.of coolant accident coincidental with a loss of'offsite power.

T h'e ' e s t i m a t e d - m a x i m u m' continuous load is 3582 kW**. This load will occur on DG 901 following a loss of coolant accident

- coincidental with a loss of offsite power supplies.

'*The rating shown in parentheses will be indicated on the nameplate to 'show the values _ to be used for periodic testing.

These reduced rating exceed the expected maximum coincident load.

'** Colt DG installation (HVAC, for example) results in a somewhat.

higher - maximum. calculated coincidental and continuous electrical loads.than the present FSAR values.

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SNPS-1 CDG DG 902 is enveloped for the maximum coincident demand and the maximum continuous load by DG 903 and DG 901 respectively as indicated above.

3.4 STARTING Each diesel engine.has redundant, independent air-start systems.

Engine cranking is accomplished by. appropriate sequencing of air to the pistons from two stored air- supplies. Each redundant system.has sufficient capacity to start the engine at least five times without recharging from the air compressor. Fast starting and loading are facilitated by heaters which maintain the diesel engine in a1 warm condition.

On f ailure. of offsite power, each diesel enerator starts and, upon reaching a- pre-set speed and voltage, connects to its respective' 4160 V bus automatically. All engineered safety features and emergency shutdovn loads, if required, are then automatically applied in the proper sequence.

On high drywell pressure or low reactor water level, each diesel generator automatically starts but remains disconnected from its respective bus if offsite power is available.

For-' testing purposes, each unit is provided with synchronizing' equipment to allow manual startup synchronizing and loading onto a live bus.

The loading sequence .of each unit. is designed in a manner that will- prevent system instability during the period of load application. A fast responding exciter and a voltage regulator ensure. quick voltage recovery after any load addition.

3.5 TRIPPING SYSTEM-d Each diesel generator- is equipped with protective relays which '

will shut the-unit down. automatically in the. event of unit faults.

During operation under emergency conditions, trip conditions are

-limited to those. which, if . allowed to continue, would rapidly result in the loss of the diesel generator. .Each diesel generator is tripped automatically under the'following conditions:

Trip Normal / Loss-Function of Power / Test LOCA

1. Reverse power X

2. Loss of excitation X

~3. Overcurrent - voltage restrained X X 4 .- Generator differential X X 5 ~. Lube oil low pressure (2 out of X X 3 trip. logic)

-6. Overspeed X X 3-2

SNPS-1 CDG 3 .' 6 SURVEILLANCE Surveillance instrumentation is provided to monitor the status of each diesel generator. Provisions for surveillance aie an essential requirement in the design, manufacture, installation,

_ testing, operation , and maintenance of these diesel g e r: e r a t o r s .

Such surveillance not only provides continuous monitoring of it.u status of-the diesel generators so as to indicate their readiness to perform ~their intended function, but also serves to fac!.litate

. testing and maintenance of the equipment. Conditions which can

_ adversely affect performance of the diesel generators are annunciated locally and in the main control room. The following list shows the important functions that are annunciated:

-Function Alarm , _ _

Cont.ol Local

• Root _

Fuel oil day tank l'evel low X Fuel oil day tank level'high- X Fuel oil transfer. system not in' auto X Fuel' oil transfer pump 201 locked out X Fuel oil transfer. pump 202 locked out X Standby fuel oil pump running X

' Fuel oil storage tank No.-1 level low X Fuel oil ~ storage tank No. 2 level low- X

. Fuel. oil pressure low X Fuel' oil filter differential pressure high' X Annunciator ground X

. Fuel oil strainer differential pressure high X

, Lube oil pressure low pre-trip X

• All' local alarms annunciate in the Main Control Room on a Common

.DG Trouble alarm.

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= Function Alarm Control Local

• Room

-Crankcase lube' oil level'1ow- X Lube oil temperature 1high X

Lube oil-pressure: low shutdown X X

. Lube oilLmakeup tank-level low- X Lube oil temperature low- X LubeJ oil 1 keep '-tarm temperature low X 1 Lube-oil: keep! warm temperature high X 1  : Crankcase lube oil 1 level high X

'Robkerfarm lube' oil pressure low X'

Ro'cker arm lube oil tank level high' X-Crankcase pressure-high' X JLube'-- oil' filter differential 1 pressure high X Lube oil strainer differential pressure high, X Jacket water expansion. tank level low X

-Jacket water. temperature low. X

' Jacket water-keep warm temper'ature low X

' Jacket water pressure-low X Jacket water expansion tank levelLhigh X

~ Jacket water expansion tank filling X 4 Jacket water'temperatu're high X

' Jacket water' keep warm temperature high X-Service water flow' low X Intercooler water pressure low X Intercooler water temperature high X 3-4

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,- .SNPS-1 CDG 7 Function Alarm Control Local

• _ Room iGeneratorfspacet heater loss of control power X t

Diesel unit.not available X.

TEmergency'stopiactua'ted X Startina air pressure-low X

Start failure' X Combustion'. air temperature'high X Diesel' engine in local control X Loss of ac powe'r- X

. Voltage regulator power failurc X X IGovernor PT fuse blown. X Diesel engine overspeed- X X.

= Diesel engine locked.out for-maintenance X Lossiof de power X Any: control switch not in' auto X

' Voltage-regulator PT fuse blown' X

. Diesel system inoperative 'X~

Diesel engine trouble (reflashed) X Diesel ~ system-degraded X Diesel main control board disabled -X 4

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, _ 'SECTION 4'

DIESEL' GENERATOR' AUXILIARY SYSTEMS-1 4.1/ : APPLICABLE CODES,' STANDARDS,' AND SPECIFICATIONS i

N Installa, tion ofi saf_ety-related piping systems will be. accomplished in' accordance' with i ASME Section. XI, 1980 ' Edition, Winter '1981 JAddendumE-andi applicable specifications as part of the station modification program. TheseLColt diesels:are-replacements for the

. original ^ TDI;l diesel ' emergency power system . which already had been ,

completely _ installed, N-5 certified,'andl operated..

4H .4.2l DIESEL. GENERATOR FUEL OIL. STORAGE AND' TRANSFER SYSTEM-14 . 2 . 1' . Design _ Bases ,

The). three 3 diesel . engines . operate o n N o . ; 2 fuel oil. Each .- engine .

. . is : supplied by ; a ; separat'e diesel-generator fue'l oil storage - and ytransfer' system. design toiallow for.7 days.of continuous' operation of'the' diesel engine at rated. . load . . All. safety-related' portions

.of?the diesel':generatorz fuel .. oil storage and transfer system 1 are Tdesigned Ito ASME: III, : Code Class 3 and ' Seismic CategoSy I' requirements.

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=Thefsystem;designt incorporated. sufficient redundancy to' prevent a i  : malfunction' . or 1 f ailure of any . single active' ,or passive ' comp nent

fromtimpairing the

capability of:the system to supply. fuel.or1 to at least two of'the diesel' engines'.

, Missile -protection 'is 'provided' forl the" fuel ' oil storage and transfer systems in accordance with General Design Criterion 4 of:

110CFR50, Appendix A.

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' System ~

Description:

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- The: diesel" generator fuel -oil storage: an'd transfer system consists

of: -

- . Six 4 diesel: fuel: oil! 'storag'e tanks - (three supplementary 1 and

1. - ~ three main tanks) > .

.two for each.' diesel engine. Each set of storage ,tanksL -has a capacity of 6 6 ,0 0 0 1ga llon s ,'- providing sufficient- fuel ' oil- ~ for continuous ' operation .of the

. associated. diesel-engine at rated load for-7 days. Each' tank Lis vented to. atmosphere.

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.SNPS-1..'CDG 2 .s Six > : 10.-g'pm , Ifull-capacity, electric motor-driven rotary positive' displacement fuel oil: transfer pumps ~(two' pumps for

.each J set' of diesel generatorJfuel . oil storage -tanks) .

Each-

. pump 5 has a relief- valve-' discharging ' back to its associated N suction:line. Each ~ dieselJ. generator . fuel oil transfer pump

is ; l mounted O directly above :its a'ssociated main fuel-- oil-

storage, tank'.

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3.  : A s diesel' Jgenerator fueljoil day tank for'each diesel engine 7

situated- in ?the associated diesel generator room.

.Each diesel 1 generator fuel o i l d a y tank is sized to store 550-(gallons.of:fueli: oil and is'aupplied with a-flame; arrestor on

the: vent.

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l4 . - Lone 14-gpm,- shaft drivenJ positiv'e displacement fuel -oil booster , pump'.and .one 13.-gpm , .ac motor-driven positive

displacement fuel

oil - standby. pump , . per _ diesel engine. . The-J z . shaft-driven ' booster .and ac . motor-driven , standby. pump. are -

~: piped , in 1parallel and. m o u r. t e d o n t h e ' d i e s e l engine skid.

Each pump discharge is; equipped with a relief valve back to the pump suction. A~1arge mesh Y-type (fuel-oil strainer-is

@ ' locate'd upstream of each booster pump.'

G . (4.'3- DIE'SEL GENERATOR COOLING WATER SYSTEM

, ~4.3'.'11 ' Design' Bases

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, TheEdiesel generator cooling water system (is designed-to provide an adequate-flow of servi'e. c water to limit-the temperature rise-of

- theKjacket7 water and'intercooler water'through.the engine..-Each ~

of. the . three ; diesel' generators hasiits own. j acket - cooling _ water (and.intercooler' system.

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The 7engineJ jacket- cooling.;' water :and intercooler system, . heat n exchangers, : keep-warm;-pump,. keep-warm'. heater, and piping are

- ~ designed . - to - ASME .. Section . III ' Code Class 3.- The shaft-driven

.en'gine ' j acket; water .~an'd ' intercooler circulatio'n pumps are' designed:

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I 'according -to manufacturer's' -s t a n d a r d s .- All components of. the-

' die'sel; generator cooling water = systems'.-are designed and. qualified

. to? Seismici Category I : requirements.. The diesel cooling water

_ : systems < are E furnished as' a part ~ of'the diesel generator package,

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~ pre-piped by the manufacturer.

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g Each dieseligenerator.' cooling. water. system consists of:

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. 1-. [On'e-shaft driven jacket water circulation pump

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.2.. _ Three-water temperature. regulating valves, which maintain.the-

_, l engine <jacketpcooling water, intercooling. water, and injector

= c o o l i n g L w a t e r E a t _ a'- p r o p e r t e m p e r a t u r e -- w h e n the engine ' is

r u n n i n g

: a n d 1 w h i c h -' .i n c l u d e a method. of bypassing the . heat

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. exchanger?for fast engine warmup-p 3'. ; foiteij acket h wate r ; expansion tank for water expansion for both

- ' systems

~ 4 '. One electric immersion heater - located on the engine skid, thermostatically ' , controlled to maintain the engine jacket-1 cooling water warm;when the engine is not running

5. . -. o n e ac t motor-driven' jacket; water keep-warm. pump,'for moving the ~ water' through ~ the _ j acket' cooling water system when the

-enginerisinot-irunning 2

'6. Two hea't;exchangers for. maintaining the. engine jacket cooling

-- and .inte rc'oole r water at: the ' desired . temperature. They are

of . the: shell and. tube . type ' with the jacket . water; flowing _

-through the:shell;and the" service water flowing;through the 3

-tubes.

17 . ; .One- engine-driven ~ .intercooler _ pump., The d$esel generator, cooling Cwater. systems-- are - completely self _ contained closed -

-loops,_-with the engine _ jacket' water.and intercooler used for-cooling - the various- engine - components. Thei service water system-is interfaced.with the engine jacket-cooling water and

+u . intercooler* systems'_; only at the engine jacket' cooling water

-heat l exchanger.

hch diesel-_ generator cooling. water system set - (j acket water and wintercooler) .' is a completely independent system,7thereby

satisfying the single failure. criteria by assuring operation T< of'atileast.two.of the three diesel generatore.

>6 [4.4 ~ DIESEL GENERATOR.1 AIR' START SYSTEM

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d .14".1 ' Design. Bases Each! diesel? generator-has_a~ separate air' start system designed to

, ;be; capable.- of' starting :thei diesel engine ' without external power s .and ialso J to ; meet the' single failure criterion.. The. air storage

,u itanks and pipingLbetween_ tanks and-the air start distributors are

.~

Ldesigned to.ASME' Boiler-and_ Pressure Vessel Code Section III Class

. 3 ~. . All-. other 1 portions .of~ this- system are designed t o .-

manufacturer's-1 standards and Seismic. Category- I requirements, except: the air compressor--(Seismic Category II).

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SNPS-1.CDG 4.4.2 System Description other.than_a common air compressor and refrigerant air drier with moisture trap, each redundant start system includes the following:

1.- Two check valves

. 2. -Two' air storage tanks with relief valves and drain valves.

3. One manual shutoff valve

4. One strainer

5. Instrumentation and control systems

6. ' Air start distributor system Each air start system is of sufficient volume to be capable of cranking ;the engine for a minimum of five starts without recharging the tanks.

- Each. motor-driven. air compressor has the capacity to recharge the air storage system in 60 minutes to provide for a minimum of five

. starts. Its motor is furnished with automatic start and stop control on pressure signals from the_ air storage tanks.

The instrumentation and controls are designed and fabricated to

- manufacturer's standards and are of-a proven, reliable design.

R 4.5 DIESEL' GENERATOR LUBRICATION SYSTEM r

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', 4.5.lf Design Bases e Each diesel generator has its lubrication system integral with the diesel engine.

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,('" ;The diesel _ generator lubrication- sy' stem is designed -to have sufficient capacity to ensure adequate lubrication of main bearings,. crank . pins , crankshaft -bearings, valve gear,- rocker arms, and all other oil lubricated wearing parts. The oil is also used for piston cooling. Manufacturing standards are as indicated All the components of the lubrication system

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.in Section 4.4.2.

are qualified Seismic Category I.

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4.5.2; System Description Each ; diesel generator . lubrication system includes the following equipment:

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'1.. One direct engine-driven lubricating oil pump _(Manufacturer's Standard) 2 .- One . ac motor-driven . prelube keep-warm ' pump to supply warm lubricating ' oil to the engine sump. and other necessary components when the engine is not running and to provide lube oil' filtration when the engine is running, as well as supply pressurized oil to the engine block until the shaft-driven

- pump reaches effective speed (ASME III Class 3)

3. lubricating oil' filters and strainers of the simplex type (ASME III Class 3)-

4; -One lubricating oil cooler of the shell and tube heat exchanger type, capable of. ~ controlling the lubricating oil temperature at the required levels by the engine jacket cooling water.(ASME III Class 3)

5. One lube oil makeup tank (ASME III Class'3)

~6.. One lube : oil- sump. built into the engine skid base (Manufacturer's Standard)

7. One lube-oil heater.(ASME III Class 3)

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One - engine-driven ' rocker-arm lube oil pump (Manufacturer's 8.

- Standard) 9.- One ac motor-driven rocker-arm lube oil pump - (Manuf acturer's Standard)

= 10 . : One rocker-arm oil. filter (Manufacturer's Standard)

11. One rocker-arm oil reservoir (Manufacturer's Standard) 4.6 COMBUSTION AIR INTAKE AND EXHAUST SYSTEM

-4.6.1 Design. Bases Each of.the three - diesel . generators has a combustion air intake and . exhaust . system. Each system is designed to withstand the effects of a- ' tornado and is provided with ' silencers to reduce noise ?to . acceptable levels. Combustion air' piping.and expansion joints are designed to ASME III Class 3. The turbocharger, intake air ffilter, and intake and exhaust silencers are designed to manufacturers' standards. All combustion air system components are qualified as Seismic Category I.

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L 4.6. 2c (System:. Description ,

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'Eachicombustion air. intake'and exhaust system consists'of:

. l' . - O n e '.'i n t a k e ' a i r ' f 1 1 t e r -

12 . Jone-! intake silencer

' piping

.3 . . Expansion jointsi and flexible connections to limit

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l'oads f ori equipment -

> ' :4. -One exhaustisilencer

, 2 :. ~ ~4.7 ? DIESEL GENERATOR ~ BUILDING VENTILATION ~

Each of f.' the -_.three '. dieself generators is located in'its own. room, Nseparated!'by' 3-hour , fire l walls ,- in a- tornado-proof Seismic

- C a t e g o r y .1 I buildin'g.

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Design: Bases

The n diesel:- ' generator ' building ventilation system -provides

. ventilating ~ air - to the; diesel-generator rooms, fuel oil day ' tank rooms,fJelectricalJequipment rooms,'an'd service equipment rooms.

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~ System Descrip' tion "Eachl diesel ' . generator room- is provided with an independent?and identical-ventilation subsystem.

' Th e -: subsystem; provides- ventilation .when: the diesel generators. ~ are 'not- operating-- and a . suitable environment. .for- equipment. 'when the- diesel- generators;

, - ;are. operating."

Each dieself-generator: room - ventilation ._ subsystem operates initwo distinct modes..

11 . Normal;v.entilation'(diesel generator.not' operating) or ' room-

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-- 2 . : ' Standby.:.-ventilation .(diesel- generator operating

temperature exceeds'.104'F) 7 Normal ~.ventilhtion consists'of' nominal. capacity exhaust' fans. The,

- u. .. fans exhaust air _from the diesel generator space'to the atmosphere

through ' tornado' . missile protected- hoods. Unit. heaters are .

s 'provided:=to. maintain minimumDspace temperature. This arrangement

- "is designated non-safety..related.

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JStandbye ventilation : consists of primary and supplementary supply.

airJfans.- Modulating outdoor, return,-and exhaust air dampers are used 'in conjunction with.the primary. fan. The primary supply air fan.i . automatically- commences  : operation whenever. the diesel.

generator- is ' operated or whenever the room temperature exceeds

104*F. ;When the diesel generator room-temperature rises to 110*F, the supplementary supply air; fan automatically starts to maintain design 1 room - temperature. This ~ arrangement is designated as QA

-: Category I.t Each of the electrical equipment rooms, fuel oil' day tank rooms, and'_ service -equipment rooms is ~ provided: with an individual

~

ventilation l subsystem for required area ventilation.

' Th'e : -electrical' equipment- rooms. are--provided with ventilating units. The ventilating _ units supply filtered air as . required.

Room temperature...is - maintained by mixing return _ air and outside air. When -outside air is . .being supplied, the excess air. is relieved' into .the = diesel ~ generator, space through a two-position motorized damper._ 'When this excess air quantity exceeds the exhaust rate from'the diesel generator _ space, a backdraft damper

-in thecnormal exhaust system ductwork relieves any pressure that develops in the. space. A unit . heater is . provided to ~ maintain minimum . space. temperature. The. electrical. equipment room Eventilation subsystem is designated'as QA Category I, except for

.the unit heater.

The fuel oil _ day tank' rooms'are served by-nominal capacity exhaust fans.- ~ The - f ans : exhaust _~ _ air - f rom the fuel oil day tank rooms

. through: fusible : link fire dampers _ to .the atmosphere to prevent ^

potential fume - buildup. - _ Supply air is introduced. to . each. room

/, through a  : transfer grill with a. fusible link fire damper. This

• subsystem is: designated non-safety related.

The service ' equipment rooms are : ventilated naturally through a-

~

doornlouver open-from the diesel generator room.: -Unit heaters-are provided to maintain minimum 1 space temperature. The unit heaters

, 'are' designated non-safety related.

' The i die'sel . generator .' auxiliary . . room ' is . provided with . two -roof ventilators and ' a unit ' heater :,to maintain the space temperature within the' allowable tolerances. The ventilator and unit heater are designated non-safety related.. .

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SNPS-1 CDG 428 ' FIRE PROTECTION SYSTEM-4.8.1 Water-Suppression Systems The' diesel ' generator Ibuilding water- fire protection systems are served by- 3 a ' 6-inch branch line entering thes building at the

~

service cubicle forJ each unit, feeding a strainer and pipe header located in the service cubicle.- The branches at approximately el

~ 15 f f eet- 9 inches extend from'a single branch line connected to~the

. main yard loop.

Emergency Diesel Generator Rooms 901, 902, and 903

^

?A complete l supervised preaction. sprinkler- system using closed fusible link sprinkler? nozzles is provided.to protect each of the

'three diesel. generator rooms. The water trajectory as it impinges onj the equipment in the room is limited to within 15 degrees '~ of-

. vertical 1. consistent with dripproof equipment design.-

N Each ' system fis designed for complete automatic actuation of the respective' deluge valve by ~ operation of. electric continuous line

's .thermistori detection system (Class IE). Manual electric and

"~

f manual mechanical operations:are also provided.

Fuel Oil: Day Tank Rooms 901, 902, and 403 i

~

J Each~

fuel oil ! day tank water spray.- system is . designed for-

.' completely' automatic.' actuation of the deluge : valve by an electric thermistor' heat detector. Manual- actuation , . instrumentation', and

= alarms tare similar to :the above. systems.

-Cable-Vaults- 901,'902, and'903 sEach . cable vault water spray system is designed for completely automatic- actuation iof the deluge. valve- by two cross-zoned

normally open circuited smoke detectors.- One zone is of the

[  ! ionization type.. The other is of the photoelectric' type. ' Manual 1 actuation, instrumentation, and alarms are similar to the above

systems.

' Hose Rack Stations

Each dervice~ room is furnished with a Class III standpipe and hose

. rack ~ station supplied with watcr from the pressurized yard loop.

. Separate _ valved .~ lines : with paddle type flow indicators running from the piping. headers.scrve'each hose rack. stations.

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-Hydrant Hose' House -

-A ihydrant_ hose house is ' located immediately to the west.of the-diesel. generator building to provide backup' fire protection..

< Halori 1301 System-

~

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- Diesel Generator Electrical' Equipment-Room.

TheY Halon ' ' 1301' ~ total _ flooding fire.- protection sy' stem for .the-Electrical . Equipment Rooms 901, 902 and .903 has a ' centrally located " main : _ cylinder and1. connected- reserve of the same size

' a n d ; L c a p a c i t y.; .a s i the -main.;

A system of valves 'and piping.

. ' conveys 'ithe Halon 1301 to. the nozzles in the - protected areas.

M' TA panel',. mounted' locally-in ~ the vicinity of the Halon '1301; . tank s ,

' houses 'the " Main Tank" and " Reserve Tank" selector s w i t c h ..w i t h

~" -indicatingflights' ' and . relays ; to ---be ,used _ in conjunction with the A , local. .. fire upanels 'for control circuit? supervision.- Halon

' cylinders are: indicated in the: auxiliary room.

~

L Automatic. actuation . is initiated by cross-zoned _ ionization type

<and4 . photoelectric type smoke detectors.- 'The detector : system

1(ClassjIE) .forf each system .is., designed to actuate a . fire alarm. c

- circuitD consistin'g :'of ' local r audible - and visual devices: and an zannunciator:onithe'mainsfire protection - panel: in the' Main control 1

! Room.- ,Each] system'also_.is-capable of ~ manual actuation: of the

%_ .Halon71301_--system via a manual' electric pushbutton switch:~ located

on- the ; local- fire protection i panel. The .Halon 1301- also is operated maaually ~ byJ a~ mechanical-operated lever ~ local- at .the '

cylinders.

64 On J a . fire d e t e c t i o n , ,- fire doors shall. automatically _ shut'.by .

deenergizing door. holder, the; electric' equipment room ventilation J trip, Land the-electric unit heater trips.

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